docs: def save(arr, filename, hdr = False, force = True, use_compression = False):
      r"""
      Save the image ``arr`` as filename using information encoded in ``hdr``. The target image
      format is determined by the ``filename`` suffix. If the ``force`` parameter is set to true,
      an already existing image is overwritten silently. Otherwise an error is thrown.
      
      The header (``hdr``) object is the one returned by `~medpy.io.load.load` and is used
      opportunistically, possibly loosing some meta-information.
      
      Generally this function does not guarantee, that metadata other than the image shape
      and pixel data type are kept.
      
      MedPy relies on SimpleITK, which enables the power of ITK for image loading and saving.
      The supported image file formats should include at least the following.
  
      Medical formats:
      
      - ITK MetaImage (.mha/.raw, .mhd)
      - Neuroimaging Informatics Technology Initiative (NIfTI) (.nia, .nii, .nii.gz, .hdr, .img, .img.gz)
      - Analyze (plain, SPM99, SPM2) (.hdr/.img, .img.gz)
      - Digital Imaging and Communications in Medicine (DICOM) (.dcm, .dicom)
      - Digital Imaging and Communications in Medicine (DICOM) series (<directory>/)
      - Nearly Raw Raster Data (Nrrd) (.nrrd, .nhdr) 
      - Medical Imaging NetCDF (MINC) (.mnc, .MNC)
      - Guys Image Processing Lab (GIPL) (.gipl, .gipl.gz)
  
      Microscopy formats:
  
      - Medical Research Council (MRC) (.mrc, .rec)
      - Bio-Rad (.pic, .PIC)
      - LSM (Zeiss) microscopy images (.tif, .TIF, .tiff, .TIFF, .lsm, .LSM)
      - Stimulate / Signal Data (SDT) (.sdt)
  
      Visualization formats:
  
      - VTK images (.vtk)
  
      Other formats:
  
      - Portable Network Graphics (PNG) (.png, .PNG)
      - Joint Photographic Experts Group (JPEG) (.jpg, .JPG, .jpeg, .JPEG)
      - Tagged Image File Format (TIFF) (.tif, .TIF, .tiff, .TIFF)
      - Windows bitmap (.bmp, .BMP)
      - Hierarchical Data Format (HDF5) (.h5 , .hdf5 , .he5)
      - MSX-DOS Screen-x (.ge4, .ge5)
          
      For informations about which image formats, dimensionalities and pixel data types
      your current configuration supports, run `python3 tests/support.py > myformats.log`.
            
      Further information see https://simpleitk.readthedocs.io .
                  
      Parameters
      ----------
      arr : array_like
          The image data with order `x,y,z,c`.
      filename : string
          Where to save the image; path and filename including the image suffix.
      hdr : object
          The image header containing the metadata.
      force : bool
          Set to True to overwrite already exiting image silently.
      use_compression : bool
          Use data compression of the target format supports it.
      
      Raises
      ------
      ImageSavingError
          If the image could not be saved due to various reasons
      """
      logger = Logger.getInstance()
      logger.info('Saving image as {}...'.format(filename))
      
      # Check image file existance
      if not force and os.path.exists(filename):
          raise ImageSavingError('The target file {} already exists.'.format(filename))
      
      # Roll axes from x,y,z,c to z,y,x,c
      if arr.ndim == 4:
          arr = np.moveaxis(arr, -1, 0)
      arr = arr.T
  
      sitkimage = sitk.GetImageFromArray(arr)
    
      # Copy met-data as far as possible
      if hdr:
          hdr.copy_to(sitkimage)
          
      sitk.WriteImage(sitkimage, filename, use_compression)